I just setup the Domain Mapping plugin for my WordPress Multisite install and setup a few new domains for a few of the subdomains sites. I added each of the new domains to the domain mapping plugin using www. prefixes. As I assumed everything worked great for the http://www.domain.com but the domain.com (without www) redirects to the root server ip.
Wondering what's the best way to make sure all the domains added to the domain mapping plugin using www redirect the domain without it to http://www.domain.com
P.S. I've seen this plugin: http://wordpress.org/extend/plugins/redirection/
but don't know if this is the best route to take.